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CairoPatternType is used to describe the type of a given pattern.
The type of a pattern is determined by the function used to create it.
The cairo_pattern_create_rgb() and cairo_pattern_create_rgba()
functions create CairoPatternType::SOLID
patterns. The remaining
cairo_pattern_create_* functions map to pattern types in obvious ways.
CairoPatternType::SOLID
The pattern is a solid (uniform) color. It may be opaque or translucent.
CairoPatternType::SURFACE
The pattern is a based on a surface (an image).
CairoPatternType::LINEAR
The pattern is a linear gradient.
CairoPatternType::RADIAL
The pattern is a radial gradient.